The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at abou...t 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.
TY - JOUR
AU - Petrović, Srđan
AU - Karanović, Ljiljana
AU - Stefanov, Plamen K.
AU - Zdujić, Miodrag
AU - Terlecki Baričević, Ana
PY - 2005
UR - http://dais.sanu.ac.rs/123456789/4838
AB - The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.
PB - Elsevier Science Bv, Amsterdam
T2 - Applied Catalysis B: Environmental
T1 - Catalytic combustion of methane over Pd containing perovskite type oxides
SP - 133
EP - 141
VL - 58
IS - 1-2
DO - 10.1016/j.apcatb.2004.11.020
ER -
@article{
author = "Petrović, Srđan and Karanović, Ljiljana and Stefanov, Plamen K. and Zdujić, Miodrag and Terlecki Baričević, Ana",
year = "2005",
url = "http://dais.sanu.ac.rs/123456789/4838",
abstract = "The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B: Environmental",
title = "Catalytic combustion of methane over Pd containing perovskite type oxides",
pages = "133-141",
volume = "58",
number = "1-2",
doi = "10.1016/j.apcatb.2004.11.020"
}
Petrović S, Karanović L, Stefanov PK, Zdujić M, Terlecki Baričević A. Catalytic combustion of methane over Pd containing perovskite type oxides. Applied Catalysis B: Environmental. 2005;58(1-2):133-141
Petrović, S., Karanović, L., Stefanov, P. K., Zdujić, M.,& Terlecki Baričević, A. (2005). Catalytic combustion of methane over Pd containing perovskite type oxides.
Applied Catalysis B: EnvironmentalElsevier Science Bv, Amsterdam., 58(1-2), 133-141.
https://doi.org/10.1016/j.apcatb.2004.11.020
Petrović Srđan, Karanović Ljiljana, Stefanov Plamen K., Zdujić Miodrag, Terlecki Baričević Ana, "Catalytic combustion of methane over Pd containing perovskite type oxides" 58, no. 1-2 (2005):133-141,
https://doi.org/10.1016/j.apcatb.2004.11.020 .
